﻿#ifndef __SS_CHECKSUM_H__
#define __SS_CHECKSUM_H__
#include "../ssBaseDefine.h"

#define MOD_ADLER 65521
#define MOD_CRC8 0x31

namespace StarSeeker
{

inline u8 BCC(const u8 *data, u32 len)
{
	u8 ret = 0;
	for (u32 i = 0; i < len; ++i)
	{
		ret ^= data[i];
	}
	return ret;
}
inline u8 BCC(const char *data, u32 len)
{
	return BCC((const u8*)data, len);
}

inline u32 Adler32(const u8 *data, u32 len)
{
	u32 a = 1, b = 0;
	for (u32 index = 0; index < len; ++index)
	{
		a = (a + data[index]) % MOD_ADLER;
		b = (b + a) % MOD_ADLER;
	}
	return (b << 16) | a;
}
inline u8 Adler32(const char *data, u32 len)
{
	return Adler32((const u8*)data, len);
}
//CRC8计算(高位1)
inline u8 CRC8HighFirst(u8 value)
{
	unsigned char i, crc;
	crc = value;
	/* 数据往左移了8位，需要计算8次 */
	for (i = 8; i > 0; --i)
	{
		if (crc & 0x80)  /* 判断最高位是否为1 */
		{
			/* 最高位为1，不需要异或，往左移一位，然后与0x31异或 */
			crc = (crc << 1) ^ MOD_CRC8;
		}
		else
		{
			/* 最高位为0时，不需要异或，整体数据往左移一位 */
			crc = (crc << 1);
		}
	}
	return crc;
}
//生成CRC8表
//void CreateCRC8Table()
//{
//	unsigned short i;
//	unsigned char j;
//	for (i = 0; i <= 0xFF; i++)
//	{
//		if (0 == (i % 16))
//			printf("\n");
//
//		j = i & 0xFF;
//		printf("0x%.2x, ", CRC8HighFirst(j));  /*依次计算每个字节的crc校验值*/
//	}
//}
//CRC8多字节计算
inline u8 CRC8Ground(const u8 *data, u32 len)
{
	unsigned char i;
	unsigned char crc = 0x00; /* 计算的初始crc值: 0 - 输入值， 1 - 输入翻转 */ 
	for (u32 index = 0; index < len; ++index)
	{
		crc ^= data[index];  /* 每次先与需要计算的数据异或,计算完指向下一数据 */
		for (i = 8; i > 0; i--)
		{
			if (crc & 0x80)
				crc = (crc << 1) ^ MOD_CRC8;
			else
				crc = (crc << 1);
		}
	}
	return crc;
}
inline char CRC8Ground(const char *data, u32 len)
{
	return (char)CRC8Ground((const u8*)data, len);
}
//CRC8多字节查表计算
inline u8 CRC8GroundByTable(const u8 *data, u32 len)
{
	static const unsigned char _crc_table[] = {
	0x0, 0x31, 0x62, 0x53, 0xc4, 0xf5, 0xa6, 0x97, 0xb9, 0x88, 0xdb, 0xea, 0x7d, 0x4c, 0x1f, 0x2e,
	0x43, 0x72, 0x21, 0x10, 0x87, 0xb6, 0xe5, 0xd4, 0xfa, 0xcb, 0x98, 0xa9, 0x3e, 0xf, 0x5c, 0x6d,
	0x86, 0xb7, 0xe4, 0xd5, 0x42, 0x73, 0x20, 0x11, 0x3f, 0xe, 0x5d, 0x6c, 0xfb, 0xca, 0x99, 0xa8,
	0xc5, 0xf4, 0xa7, 0x96, 0x1, 0x30, 0x63, 0x52, 0x7c, 0x4d, 0x1e, 0x2f, 0xb8, 0x89, 0xda, 0xeb,
	0x3d, 0xc, 0x5f, 0x6e, 0xf9, 0xc8, 0x9b, 0xaa, 0x84, 0xb5, 0xe6, 0xd7, 0x40, 0x71, 0x22, 0x13,
	0x7e, 0x4f, 0x1c, 0x2d, 0xba, 0x8b, 0xd8, 0xe9, 0xc7, 0xf6, 0xa5, 0x94, 0x3, 0x32, 0x61, 0x50,
	0xbb, 0x8a, 0xd9, 0xe8, 0x7f, 0x4e, 0x1d, 0x2c, 0x2, 0x33, 0x60, 0x51, 0xc6, 0xf7, 0xa4, 0x95,
	0xf8, 0xc9, 0x9a, 0xab, 0x3c, 0xd, 0x5e, 0x6f, 0x41, 0x70, 0x23, 0x12, 0x85, 0xb4, 0xe7, 0xd6,
	0x7a, 0x4b, 0x18, 0x29, 0xbe, 0x8f, 0xdc, 0xed, 0xc3, 0xf2, 0xa1, 0x90, 0x7, 0x36, 0x65, 0x54,
	0x39, 0x8, 0x5b, 0x6a, 0xfd, 0xcc, 0x9f, 0xae, 0x80, 0xb1, 0xe2, 0xd3, 0x44, 0x75, 0x26, 0x17,
	0xfc, 0xcd, 0x9e, 0xaf, 0x38, 0x9, 0x5a, 0x6b, 0x45, 0x74, 0x27, 0x16, 0x81, 0xb0, 0xe3, 0xd2,
	0xbf, 0x8e, 0xdd, 0xec, 0x7b, 0x4a, 0x19, 0x28, 0x6, 0x37, 0x64, 0x55, 0xc2, 0xf3, 0xa0, 0x91,
	0x47, 0x76, 0x25, 0x14, 0x83, 0xb2, 0xe1, 0xd0, 0xfe, 0xcf, 0x9c, 0xad, 0x3a, 0xb, 0x58, 0x69,
	0x4, 0x35, 0x66, 0x57, 0xc0, 0xf1, 0xa2, 0x93, 0xbd, 0x8c, 0xdf, 0xee, 0x79, 0x48, 0x1b, 0x2a,
	0xc1, 0xf0, 0xa3, 0x92, 0x5, 0x34, 0x67, 0x56, 0x78, 0x49, 0x1a, 0x2b, 0xbc, 0x8d, 0xde, 0xef,
	0x82, 0xb3, 0xe0, 0xd1, 0x46, 0x77, 0x24, 0x15, 0x3b, 0xa, 0x59, 0x68, 0xff, 0xce, 0x9d, 0xac};
	unsigned char crc = 0x00;
	for (u32 index = 0; index < len; ++index)
	{
		crc = _crc_table[crc ^ data[index]];
	}
	return crc;
}
inline char CRC8GroundByTable(const char *data, u32 len)
{
	return (char)CRC8GroundByTable((const u8*)data, len);
}

}
#endif
